A sanitary valve is classified according to its energy consumption (hot water) along the lines of the well-known European bar scale label, classified from A to F, where A is the best (low level of consumption) and F is the worst class (high level of consumption). It is possible to achieve 2 stars in each of the comfort categories. Valves for public use can accordingly receive a maximum of 6 stars, while valves for the home can be awarded up to 4.
If a sanitary valve is equipped with an accessory that has been awarded the WELL upgrade label, the rating of the valve is increased accordingly.
If several products in a product line with regard to construction, technical features and performance characteristics are identical, and only differ in shape, design or colour, the manufacturer can unite them in one product family and apply for a classification for the entire product family. In this case, the manufacturer must list all products in the product family within the application via the online form. The model name for the entire product family is to be selected as the product name.
To prove that the WELL rating criteria have been met, a report from an ISO/IEC 17025 accredited partner testing institute of EUnited Valves must be submitted.
In order to verify the standard conformity, the classification system includes an annual random sampling, monitored by a notary. Here the partner institutes of EUnited Valves check the conformity of the self-declarations and qualified test reports from the manufacturers.
The classification is valid for 5 years. An extension for another 5 years is possible.